What is the difference between the effective refractory period and the relative refractory period?

What is the difference between the effective refractory period and the relative refractory period?

In the cardiovascular mechanism, this refractory period is sometimes called effective refractory period (ERP). The relative refractory period is the period that occurs during the undershoot phase; where an action potential can be activated but only if the trigger (stimulus) is large enough.

What is effective refractory period in cardiac muscle?

The effective refractory period (ERP) of a cardiac tissue is the longest interval of the input into a part of the conduction system that fails to propagate through that tissue. For example, the atrial ERP is defined by the longest S1S2 interval that fails to capture the atrium.

Does the heart have a relative refractory period?

(b) The action potential for heart muscle is compared to that of skeletal muscle. The absolute refractory period for cardiac contractile muscle lasts approximately 200 ms, and the relative refractory period lasts approximately 50 ms, for a total of 250 ms.

What is the major difference between effective absolute refractory period ERP Arp and relative refractory period RRP )?

The total refractory period is comprised of the (1) absolute refractory period (ARP) or effective refractory period (ERP), which is the period during which an electrical stimulus will not elicit an AP because the membrane is not sufficiently repolarized and sodium channels have not completely recovered; (2) relative …

What is relative refractory period?

Medical Definition of relative refractory period : the period shortly after the firing of a nerve fiber when partial repolarization has occurred and a greater than normal stimulus can stimulate a second response — compare absolute refractory period.

Where is the effective refractory period?

During phases 0, 1, 2, and part of phase 3, the cell is refractory to the initiation of new action potentials. This is termed the effective refractory period (ERP).

Why is it called relative refractory period?

As voltage-gated Na+ channels transition from the inactivated to the closed state (i.e., they become capable of being activated), the membrane becomes capable of supporting a 2nd action potential – this period is called the RELATIVE REFRACTORY PERIOD.

What is the importance of relative refractory period?

Why is the Relative Refractory Period Important For Our Bodies? The relative refractory period prevents the same stimulus from becoming overwhelming. Since it takes a greater stimulus to produce an action potential, the body needs more sensory input to continue feeling the same way.

What are relative and absolute refractory periods?

The main difference between absolute and relative refractory period is that absolute refractory period is the period of time during which a second action potential absolutely cannot be initiated whereas relative refractory period is the interval immediately after the absolute refractory period.

Why is it called the relative refractory period?